I tried to find a good answer here and around but still have a question mark over my head.I hope i don't repost this topic...

I have a 4x12 Cab with Stero Input 2x8 Ohm and Mono 1x12 Ohm from Factory!Yes 12 Ohm its has 2x8 and 2x16 Ohm Speaker in it by Factory.So i hooked up the Cap with 2 Speaker Cable as 2x8 Ohm Cabs.Not sure if that makes a different.

Now i've bought 4 new EVM 12L Speakers with 8 Ohm Factory Print on it.When i measure the Impedance of the Speakers i measure 4.3, 5.3, 5.0 and 4.7 Ohm.When i measure other 8 Ohm Speakers from other Manufacture i measure around 6.8 and 7.4 Ohm.I contact Electronic Voice and asked if that really correct and they say when they have a Impedance Value everything is ok.

Of course the direct measured Impedance Value is lower than the real Impedance,but that low for 8 Ohm Speaker and so different Values???I found in the web more which have measured these Values... even 5.3 for a 16 Ohm labelled.

When i'm correct the Impedance Value of a Speaker is attached to the Frequency of the Signalwith a Range between the direct measured Value as Minimum and even over 40 Ohm and more as Maximum?

Now i asked myself how to hock up Speaker like this to my Herbert.In a Manual from one of my other Amps (from another Company) i found:

Quote:

--------------------------------------------------------------------------------SPEAKER: The Amp is not very sensitive to impedance mismatching and therefore we encourage experimentation with regards to speaker loads. You may feel free to try an 8 Ohm load on the 4 Ohm jack or a 16 Ohm load on the 8 Ohm jack as you may discover a characteristic that the mismatched load imparts on the sound that is desirable.

Our 4x12 cabinets are wired in Series/Parallel and are rated at 8 Ohms and these should normally be connected to the 8 Ohm jack. When using two of our 8 Ohm 4x12 cabinets, connect them each to a 4 Ohm jack as doubling the load on each jack produces a total load of 8 Ohms and is a proper impedance match.

Feel free to use speaker cabinets built by other manufacturers and these are often wired to produce a 16 Ohm load which you would want to connect to the 8 Ohm jack. Two 16 Ohm cabinets would be connected each to an 8 Ohm jack.

Overall our Amp is very impedance friendly and most speaker loads will work great with the exception of slightly shorter power tube life occurring when a mismatch in the low direction (two 4 Ohm cabs - each in a 4 Ohm jack to produce a total load of 2 Ohms) is used for long periods of time. --------------------------------------------------------------------------------

Of course i want to know how "dangerous" is a Impedance mismatch for a Diezelespecially for the Herbert.

Who is online

You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum